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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
package org.apache.tools.ant.taskdefs;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.zip.GZIPInputStream;
import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.util.FileUtils;
/**
* Expands a file that has been compressed with the GZIP
* algorithm. Normally used to compress non-compressed archives such
* as TAR files.
*
* @since Ant 1.1
*
* @ant.task category="packaging"
*/
public class GUnzip extends Unpack {
private static final int BUFFER_SIZE = 8 * 1024;
private static final String DEFAULT_EXTENSION = ".gz";
/**
* Get the default extension.
* @return the value ".gz"
*/
protected String getDefaultExtension() {
return DEFAULT_EXTENSION;
}
/**
* Implement the gunzipping.
*/
protected void extract() {
if (source.lastModified() > dest.lastModified()) {
log("Expanding " + source.getAbsolutePath() + " to "
+ dest.getAbsolutePath());
FileOutputStream out = null;
GZIPInputStream zIn = null;
InputStream fis = null;
try {
out = new FileOutputStream(dest);
fis = srcResource.getInputStream();
zIn = new GZIPInputStream(fis);
byte[] buffer = new byte[BUFFER_SIZE];
int count = 0;
do {
out.write(buffer, 0, count);
count = zIn.read(buffer, 0, buffer.length);
} while (count != -1);
} catch (IOException ioe) {
String msg = "Problem expanding gzip " + ioe.getMessage();
throw new BuildException(msg, ioe, getLocation());
} finally {
FileUtils.close(fis);
FileUtils.close(out);
FileUtils.close(zIn);
}
}
}
/**
* Whether this task can deal with non-file resources.
*
* <p>This implementation returns true only if this task is
* <gunzip>. Any subclass of this class that also wants to
* support non-file resources needs to override this method. We
* need to do so for backwards compatibility reasons since we
* can't expect subclasses to support resources.</p>
* @return true if this task supports non file resources.
* @since Ant 1.7
*/
protected boolean supportsNonFileResources() {
return getClass().equals(GUnzip.class);
}
}
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